Attachment for a cap



FIG. 1 is a top, front, and right side perspective view of an attachment for a cap according to our new design;

FIG. 2 is a front elevation view thereof;

FIG. 3 is a rear elevation view thereof;

FIG. 4 is a top plan view thereof;

FIG. 5 is a bottom plan view thereof;

FIG. 6 is a left side elevation view thereof;

FIG. 7 is a right side elevation view thereof; and,

FIG. 8 is a top, front, left side perspective view showing the attachment attached to a cap.

The broken lines of the attachment for a cap depiction portions of the article that form no part of the claimed design. The cap shown in broken lines in FIG. 8 depicts environmental structure that forms no part of the claimed design. 

CLAIM The ornamental design for an attachment for a cap, as shown and described. 